The patch titled
Subject: mm: add prototype for __add_to_page_cache_locked()
has been added to the -mm tree. Its filename is
mm-add-prototype-for-__add_to_page_cache_locked.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-add-prototype-for-__add_to_page_cache_locked.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-add-prototype-for-__add_to_page_cache_locked.patch
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------------------------------------------------------
From: Souptick Joarder <jrdr.linux@xxxxxxxxx>
Subject: mm: add prototype for __add_to_page_cache_locked()
Otherwise it causes a gcc warning:
../mm/filemap.c:830:14: warning: no previous prototype for
`__add_to_page_cache_locked' [-Wmissing-prototypes]
A previous attempt to make this function static led to compilation errors
when CONFIG_DEBUG_INFO_BTF is enabled because __add_to_page_cache_locked()
is referred to by BPF code.
Adding a prototype will silence the warning.
Link: https://lkml.kernel.org/r/1608693702-4665-1-git-send-email-jrdr.linux@xxxxxxxxx
Signed-off-by: Souptick Joarder <jrdr.linux@xxxxxxxxx>
Cc: Alex Shi <alex.shi@xxxxxxxxxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/mm.h | 7 +++++++
1 file changed, 7 insertions(+)
--- a/include/linux/mm.h~mm-add-prototype-for-__add_to_page_cache_locked
+++ a/include/linux/mm.h
@@ -216,6 +216,13 @@ int overcommit_kbytes_handler(struct ctl
loff_t *);
int overcommit_policy_handler(struct ctl_table *, int, void *, size_t *,
loff_t *);
+/*
+ * Any attempt to mark this function as static leads to build failure
+ * when CONFIG_DEBUG_INFO_BTF is enabled because __add_to_page_cache_locked()
+ * is referred to by BPF code. This must be visible for error injection.
+ */
+int __add_to_page_cache_locked(struct page *page, struct address_space *mapping,
+ pgoff_t index, gfp_t gfp, void **shadowp);
#define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n))
_
Patches currently in -mm which might be from jrdr.linux@xxxxxxxxx are
mm-add-prototype-for-__add_to_page_cache_locked.patch
